I can see how it could be so tempting. I have been to the point of typing my details into those sites then deleted them, but then I suppose I have been very lucky in that we have had family who have been able to help us get out of tight spots (eg it took 11 weeks between DP losing his job and us getting a penny of benefits through no fault of our own. The DWP gave us £50 compensation for leaving us possibly starving for all that time, with me pregnant and a two year old DD).
However, while I am completely in favour of people spending money how they like, so if they want to save up for a big tv from thier benefits, fair enough, I do have the suspicion a lot of people see things as essential that just aren't. Once you have one person in work, you really should, unless you have a really unusual situation, have enough to live on. We have a wonderful tax credits system that really helps. Again though, my family are lucky enough to have the education to be able to cook from scratch, search for the best deals on bills, find offers and schemes for entertainment and apply for all we are entitled to.
I agree that payday loan/brighthouse places need to be stopped, and also that "normal" banks badly need sorting out. I used to find myself using those cheque cashing places when I used to get paid by cheque and couldn't wait for the cheque to clear, and the fees meant that each week I got worse off.
I now use a bank called think bank, where I pay a fee of £12 a month and don't have any bank charges, which saves me around £50 and a lot of worry every month. I would recommend it to anyone like me who is rubbish with money.